ConstructorSift.java Source code

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Here is the source code for ConstructorSift.java

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/*
 * Copyright (c) 1995 - 2008 Sun Microsystems, Inc.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Sun Microsystems nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

import static java.lang.System.out;

import java.lang.reflect.Constructor;
import java.lang.reflect.Type;

public class ConstructorSift {
    public static void main(String... args) {
        try {
            Class<?> cArg = Class.forName(args[1]);

            Class<?> c = Class.forName(args[0]);
            Constructor[] allConstructors = c.getDeclaredConstructors();
            for (Constructor ctor : allConstructors) {
                Class<?>[] pType = ctor.getParameterTypes();
                for (int i = 0; i < pType.length; i++) {
                    if (pType[i].equals(cArg)) {
                        out.format("%s%n", ctor.toGenericString());

                        Type[] gpType = ctor.getGenericParameterTypes();
                        for (int j = 0; j < gpType.length; j++) {
                            char ch = (pType[j].equals(cArg) ? '*' : ' ');
                            out.format("%7c%s[%d]: %s%n", ch, "GenericParameterType", j, gpType[j]);
                        }
                        break;
                    }
                }
            }

            // production code should handle this exception more gracefully
        } catch (ClassNotFoundException x) {
            x.printStackTrace();
        }
    }
}